i cant enable the imessage account on my mac

Hi

I would also try a PRAM reset.

Shut down the computer.

Restart it holding down Apple/CMD ( or ⌘)+ALT( ⌥)+P+R Keys until you have heard three Start Up Bongs.

9:14 PM Tuesday; November 27, 2012

Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

 iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images."  No, Seriously

Hi,

New info.

Is your Serail Number Missing ?

Open the Apple iCOn menu and select ABout this Mac

Click the line that shows the OS version twice.

(it shows the Build number and then the Serial Number)

If the Serial Number is missing it needs to be replaced.

It seems it is now used as part of the Security/Verification Process that places a Certificate for iMessages in the Keychain.

It also seem an Apple Store or Apple Authorised Service Provider can restore the Serial Number (it gets "flashed" to an eprom chip)

10:46 PM Saturday; December 15, 2012

Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

 iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images."  No, Seriously

Humm,

I thought I had scanned the thread before I reposted about the Serial Number. Sorry about that.

Make the Finder the app that shows in the Menu Bar.

Use the Go Menu > Go to Folder and type ~/Library/Preferences in the dialogue box that appears.

Find the com.apple.imservice.Message.plist and drag it to the Trash

Repeat for com.apple.imessages.bag.plist

Restart Messages

8:04 PM Sunday; December 16, 2012

Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

 iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images."  No, Seriously